A compact ultrawideband (UWB) antenna with reconfigurable triple band notch characteristics is proposed in this paper. The antenna consists of a coplanar waveguide-fed top-cut circular-shaped radiator with two etched C-shaped slots, a pair of split-ring resonators (SRRs) on the backside and four p-type intrinsic n-type (PIN) diodes integrated in the slots and SRRs. By controlling the current distribution in the slots and SRRs, the antenna can realize eight band notch states with independent switch ability, which allows UWB to coexist with 5G (3.3–4.4 GHz)/WiMAX (3.3–3.6 GHz), WLAN (5.15–5.825 GHz), and X-band (7.9–8.4 GHz) bands without interference. By utilizing a nested structure of C-shaped slots and SRRs on the backside, a compact size of 18 × 19.5 mm2 is achieved along with multimode triple band notch reconfigurability. The antenna covers a bandwidth of 3.1–10.6 GHz. A prototype is fabricated and tested. The simulated and experimental results are in good agreement.

中文翻译：

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具有三频段陷波可重构性的紧凑型 UWB 天线

本文提出了一种具有可重构三频段陷波特性的紧凑型超宽带（UWB）天线。该天线由一个共面波导馈电的顶切圆形辐射器和两个蚀刻的 C 形槽、一对位于背面的裂环谐振器 (SRR) 和四个 p 型本征 n 型 (PIN) 二极管组成集成在插槽和 SRR 中。通过控制槽和SRR中的电流分布，天线可以实现8个带独立切换能力的陷波状态，使UWB与5G（3.3-4.4 GHz）/WiMAX（3.3-3.6 GHz）、WLAN（5.15- 5.825 GHz) 和 X 波段 (7.9–8.4 GHz) 波段，无干扰。通过在背面采用 C 形槽和 SRR 的嵌套结构，实现了 18 × 19.5 mm 的紧凑尺寸2与多模三频段陷波可重构性一起实现。天线覆盖 3.1–10.6 GHz 的带宽。制作并测试了原型。模拟结果与实验结果吻合较好。